#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define debug(x) cerr << '[' << (#x) << "] = " << x << '\n';
template<class T> using ordered_set = tree<T, null_type , less<T> , rb_tree_tag , tree_order_statistics_node_update> ;
void PlayGround() {
int N; cin >> N;
vector<int>a(N);
for(int i=0; i<N; ++i) cin >> a[i];
sort(a.begin(), a.end());
if(N < 4) {
cout << 1 << '\n' << a[0] << '\n' << N-1 << '\n';
for(int i=1; i<N; ++i) cout << a[i] << ' ';
cout << '\n';
return;
}
auto print = [=] (deque<int>&x, deque<int>&y) {
sort(x.begin(), x.end());
sort(y.begin(), y.end());
cout << x.size() << '\n';
for(auto it : x) cout << it << ' ';
cout << '\n';
cout << y.size() << '\n';
for(auto it : y) cout << it << ' ';
cout << "\n";
};
vector<int>b = {0, 1, 2};
do {
deque<int>x;
x.push_back(a[b[0]]);
x.push_back(a[b[1]]);
deque<int>y;
y.push_back(a[b[2]]);
if(x[0]>x[1]) swap(x[0], x[1]);
int dif = x[1] - x[0];
for(int i=3; i<N; ++i) {
if(a[i]-x.back()==dif) x.push_back(a[i]);
else if(a[i]-x.front()==dif) x.push_front(a[i]);
else if(y.size()<2 || a[i]-y.back()==abs(y[0]-y[1])) y.push_back(a[i]);
else if(y.size()<2 || a[i]-y.front()==abs(y[0]-y[1])) y.push_front(a[i]);
else break;
}
if(int(x.size()+y.size())==N) {
print(x, y);
return;
}
} while(next_permutation(b.begin(), b.end()));
deque<int>x, y;
x.push_back(a[0]);
x.push_back(a[1]);
if(a[2]-x.back()==x[1]-x[0]) x.push_back(a[2]);
else if(a[2]-x.front()==x[1]-x[0]) x.push_front(a[2]);
else {
cout << -1 << '\n';
return;
}
int dif1 = abs(x[1]-x[0]), dif2;
for(int i=3; i<N; ++i) {
if(a[i]-x.back()==dif1) x.push_back(a[i]);
else if(a[i]-x.front()==dif1) x.push_front(a[i]);
else if(y.size()<2) y.push_back(a[i]);
else if(dif2==a[i]-y.back()) y.push_back(a[i]);
else if(dif2==a[i]-y.front()) y.push_front(a[i]);
else {
cout << -1 << '\n';
return;
}
if(y.size()==2) dif2 = abs(y[1]-y[0]);
}
if(y.empty()) y.push_back(x.back()), x.pop_back();
print(x, y);
#ifndef ONLINE_JUDGE
cerr << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
#endif
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
// #ifndef ONLINE_JUDGE
// freopen("input.txt", "r", stdin);
// #endif
PlayGround();
return 0;
}
Compilation message
drvca.cpp: In function 'void PlayGround()':
drvca.cpp:72:14: warning: 'dif2' may be used uninitialized in this function [-Wmaybe-uninitialized]
72 | else if(dif2==a[i]-y.front()) y.push_front(a[i]);
| ^~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
0 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
0 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
0 ms |
204 KB |
Output is correct |
9 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
0 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
0 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
0 ms |
204 KB |
Output is correct |
9 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
37 ms |
2020 KB |
Output is correct |
2 |
Correct |
37 ms |
2052 KB |
Output is correct |
3 |
Correct |
35 ms |
2044 KB |
Output is correct |
4 |
Correct |
40 ms |
2076 KB |
Output is correct |
5 |
Correct |
34 ms |
2120 KB |
Output is correct |
6 |
Correct |
37 ms |
2008 KB |
Output is correct |
7 |
Correct |
35 ms |
2072 KB |
Output is correct |
8 |
Correct |
38 ms |
2088 KB |
Output is correct |
9 |
Incorrect |
20 ms |
1028 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
204 KB |
Output is correct |
2 |
Correct |
0 ms |
204 KB |
Output is correct |
3 |
Correct |
1 ms |
204 KB |
Output is correct |
4 |
Correct |
0 ms |
204 KB |
Output is correct |
5 |
Correct |
1 ms |
204 KB |
Output is correct |
6 |
Correct |
0 ms |
204 KB |
Output is correct |
7 |
Correct |
1 ms |
204 KB |
Output is correct |
8 |
Correct |
0 ms |
204 KB |
Output is correct |
9 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
10 |
Halted |
0 ms |
0 KB |
- |